Full Idea
The ontological proof of God's existence suffers from the fallacy of treating existence as a first-level concept.
Gist of Idea
The Ontological Argument fallaciously treats existence as a first-level concept
Source
Gottlob Frege (Function and Concept [1891], p.38 n)
Book Reference
Frege,Gottlob: 'Translations from the Writings of Gottlob Frege', ed/tr. Geach,P/Black,M [Blackwell 1980], p.38
A Reaction
[See Idea 8490 for first- and second-order functions] This is usually summarised as the idea that existence is a quantifier rather than a predicate.
Related Idea
Idea 8490 First-level functions have objects as arguments; second-level functions take functions as arguments [Frege]